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Generic node (Node) Requirements

Useful local links:

• http://psas.pdx.edu/AvionicsLv2/
• http://psas.pdx.edu/CapstoneLV2b/

Requirement Semantics

There are three levels of requirements:

• MUST = The requirement must be met.
• SHOULD = We really, really want it, but don't have to have it.
• MAY = "Wow wouldn't be great if"

Requirements

• General
  • Parts cost <150$ in small quantities
  • Board size (,20,25)cm^2
  • Board height (,,12)mm
• Interfaces
  • MUST use a polarized and locking connector
  • SHOULD be able to be non-locking during development
  • MUST be rated at (100,500,) mating cycles
  • MUST have (2,4,) high reliability, high current (2,5,) A rated contacts for power
  • Must have (2,4,) high reliability contacts for USB data
  • Must have (2,4,) high reliability contacts for back-channel bus
  • Must minimize board area.
• SPS
  • Circuit must be fault tolerant/resistant/robust
  • High Efficiency (prolong Battery life)
  • Low Quiescent Current Draw (prolong battery life)
  • High Frequency Switching (1.25 MHZ) (low noise production)
  • Frequency Sync to external source (Makes noise filtering easier)
  • OVP (TODO: See 2006 capstone requirements)
  • UVLO (TODO: See 2006 capstone requirements
  • Vin (10V, 14.4V, 20V) (Voltage supplied by APS node)
  • Vout1 (,3.3,) V
  • Vout2 (,5,) V
  • Iout1 max (0.030,1,)A (range may require changes in component values)
  • Iout2 max (0.030,1,)A (range may require changes in component values)
  • Low noise
  • Soft start
• HAP
  • MUST use single Li Ion Polymer cell
  • MUST have a seamless transition from externally powered to battery-powered
  • MUST meet standard lithium charge/discharge safety requirements (thermal, voltage, current, time, fuse)
  • MUST store enough power to run generic node for (1,4,) hours (Pyro requirement)
  • MUST be able to be unpopulated on board (for most nodes)
  • MUST be able to measure battery voltage
  • MUST be able to have external charge control (from microcontroller)
• Microcontroller
  • MUST use a LPC2xxx series microcontroller
  • MUST have USB and back-channel peripherals
  • MUST have (32,64,) K RAM
  • MUST use 12 MHz crystal (for USB) and PLL to highest Freq.

Misc Notes

• TBD